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annotate doc/ltn12.html @ 4:f0a27ccb1193 tip

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author Eric Wing <ewing . public |-at-| gmail . com>
date Sat, 30 Aug 2008 08:46:39 -0700
parents 4b915342e2a8
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1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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2 "http://www.w3.org/TR/html4/strict.dtd">
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3 <html>
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4
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5 <head>
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6 <meta name="description" content="LuaSocket: LTN12 support">
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7 <meta name="keywords" content="Lua, LuaSocket, Filters, Source, Sink,
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8 Pump, Support, Library">
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9 <title>LuaSocket: LTN12 module</title>
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10 <link rel="stylesheet" href="reference.css" type="text/css">
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11 </head>
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12
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13 <body>
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14
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15 <!-- header +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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16
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17 <div class=header>
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18 <hr>
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19 <center>
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20 <table summary="LuaSocket logo">
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21 <tr><td align=center><a href="http://www.lua.org">
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22 <img width=128 height=128 border=0 alt="LuaSocket" src="luasocket.png">
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23 </a></td></tr>
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24 <tr><td align=center valign=top>Network support for the Lua language
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25 </td></tr>
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26 </table>
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27 <p class=bar>
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28 <a href="home.html">home</a> &middot;
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29 <a href="home.html#download">download</a> &middot;
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30 <a href="installation.html">installation</a> &middot;
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31 <a href="introduction.html">introduction</a> &middot;
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32 <a href="reference.html">reference</a>
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33 </p>
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34 </center>
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35 <hr>
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36 </div>
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37
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38 <!-- ltn12 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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39
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40 <h2 id=ltn12>LTN12</h2>
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41
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42 <p> The <tt>ltn12</tt> namespace implements the ideas described in
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43 <a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">
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44 LTN012, Filters sources and sinks</a>. This manual simply describes the
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45 functions. Please refer to the LTN for a deeper explanation of the
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46 functionality provided by this module.
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47 </p>
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48
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49 <p>
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50 To obtain the <tt>ltn12</tt> namespace, run:
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51 </p>
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52
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53 <pre class=example>
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54 -- loads the LTN21 module
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55 local ltn12 = require("ltn12")
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56 </pre>
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57
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58 <!-- filters ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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59
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60 <h3 id="filter">Filters</h3>
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61
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62 <!-- chain ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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63
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64 <p class=name id="filter.chain">
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65 ltn12.filter.<b>chain(</b>filter<sub>1</sub>, filter<sub>2</sub>
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66 [, ... filter<sub>N</sub>]<b>)</b>
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67 </p>
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68
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69 <p class=description>
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70 Returns a filter that passes all data it receives through each of a
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71 series of given filters.
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72 </p>
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73
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74 <p class=parameters>
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75 <tt>Filter<sub>1</sub></tt> to <tt>filter<sub>N</sub></tt> are simple
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76 filters.
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77 </p>
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78
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79 <p class=return>
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80 The function returns the chained filter.
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81 </p>
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82
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83 <p class=note>
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84 The nesting of filters can be arbitrary. For instance, the useless filter
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85 below doesn't do anything but return the data that was passed to it,
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86 unaltered.
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87 </p>
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88
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89 <pre class=example>
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90 -- load required modules
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91 local ltn12 = require("ltn12")
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92 local mime = require("mime")
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93
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94 -- create a silly identity filter
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95 id = ltn12.filter.chain(
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96 mime.encode("quoted-printable"),
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97 mime.encode("base64"),
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98 mime.decode("base64"),
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99 mime.decode("quoted-printable")
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100 )
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101 </pre>
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102
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103 <!-- cycle ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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104
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105 <p class=name id="filter.cycle">
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106 ltn12.filter.<b>cycle(</b>low [, ctx, extra]<b>)</b>
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107 </p>
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108
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109 <p class=description>
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110 Returns a high-level filter that cycles though a low-level filter by
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111 passing it each chunk and updating a context between calls.
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112 </p>
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113
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114 <p class=parameters>
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115 <tt>Low</tt> is the low-level filter to be cycled,
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116 <tt>ctx</tt> is the initial context and <tt>extra</tt> is any extra
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117 argument the low-level filter might take.
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118 </p>
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119
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120 <p class=return>
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121 The function returns the high-level filter.
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122 </p>
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123
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124 <pre class=example>
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125 -- load the ltn12 module
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126 local ltn12 = require("ltn12")
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127
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128 -- the base64 mime filter factory
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129 encodet['base64'] = function()
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130 return ltn12.filter.cycle(b64, "")
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131 end
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132 </pre>
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133
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134 <!-- pumps ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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135
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136 <h3 id="pump">Pumps</h3>
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137
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138 <!-- all ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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139
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140 <p class=name id="pump.all">
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141 ltn12.pump.<b>all(</b>source, sink<b>)</b>
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142 </p>
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143
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144 <p class=description>
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145 Pumps <em>all</em> data from a <tt>source</tt> to a <tt>sink</tt>.
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146 </p>
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147
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148 <p class=return>
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149 If successful, the function returns a value that evaluates to
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150 <b><tt>true</tt></b>. In case
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151 of error, the function returns a <b><tt>false</tt></b> value, followed by an error message.
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152 </p>
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153
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154 <!-- step +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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155
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156 <p class=name id="pump.step">
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157 ltn12.pump.<b>step(</b>source, sink<b>)</b>
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158 </p>
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159
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160 <p class=description>
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161 Pumps <em>one</em> chunk of data from a <tt>source</tt> to a <tt>sink</tt>.
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162 </p>
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163
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164 <p class=return>
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165 If successful, the function returns a value that evaluates to
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166 <b><tt>true</tt></b>. In case
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167 of error, the function returns a <b><tt>false</tt></b> value, followed by an error message.
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168 </p>
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169
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170 <!-- sinks ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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171
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172 <h3 id="sink">Sinks</h3>
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173
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174 <!-- chain ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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175
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176 <p class=name id="sink.chain">
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177 ltn12.sink.<b>chain(</b>filter, sink<b>)</b>
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178 </p>
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179
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180 <p class=description>
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181 Creates and returns a new sink that passes data through a <tt>filter</tt> before sending it to a given <tt>sink</tt>.
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182 </p>
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183
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184 <!-- error ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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185
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186 <p class=name id="sink.error">
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187 ltn12.sink.<b>error(</b>message<b>)</b>
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188 </p>
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189
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190 <p class=description>
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191 Creates and returns a sink that aborts transmission with the error
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192 <tt>message</tt>.
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193 </p>
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194
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195 <!-- file +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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196
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197 <p class=name id="sink.file">
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198 ltn12.sink.<b>file(</b>handle, message<b>)</b>
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199 </p>
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200
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201 <p class=description>
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202 Creates a sink that sends data to a file.
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203 </p>
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204
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205 <p class=parameters>
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206 <tt>Handle</tt> is a file handle. If <tt>handle</tt> is <tt><b>nil</b></tt>,
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207 <tt>message</tt> should give the reason for failure.
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208 </p>
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209
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210 <p class=return>
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211 The function returns a sink that sends all data to the given <tt>handle</tt>
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212 and closes the file when done, or a sink that aborts the transmission with
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213 the error <tt>message</tt>
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214 </p>
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215
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216 <p class=note>
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217 In the following example, notice how the prototype is designed to
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218 fit nicely with the <tt>io.open</tt> function.
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219 </p>
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220
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221 <pre class=example>
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222 -- load the ltn12 module
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223 local ltn12 = require("ltn12")
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224
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225 -- copy a file
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226 ltn12.pump.all(
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227 ltn12.source.file(io.open("original.png")),
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228 ltn12.sink.file(io.open("copy.png"))
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229 )
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230 </pre>
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231
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232 <!-- null +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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233
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234 <p class=name id="sink.null">
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235 ltn12.sink.<b>null()</b>
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236 </p>
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237
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238 <p class=description>
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239 Returns a sink that ignores all data it receives.
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240 </p>
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241
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242 <!-- simplify +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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243
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244 <p class=name id="sink.simplify">
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245 ltn12.sink.<b>simplify(</b>sink<b>)</b>
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246 </p>
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247
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248 <p class=description>
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249 Creates and returns a simple sink given a fancy <tt>sink</tt>.
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250 </p>
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251
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252 <!-- table ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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253
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254 <p class=name id="sink.table">
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255 ltn12.sink.<b>table(</b>[table]<b>)</b>
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256 </p>
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257
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258 <p class=description>
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259 Creates a sink that stores all chunks in a table. The chunks can later be
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260 efficiently concatenated into a single string.
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261 </p>
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262
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263 <p class=parameters>
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264 <tt>Table</tt> is used to hold the chunks. If
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265 <tt><b>nil</b></tt>, the function creates its own table.
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266 </p>
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267
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268 <p class=return>
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269 The function returns the sink and the table used to store the chunks.
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270 </p>
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271
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272 <pre class=example>
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273 -- load needed modules
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274 local http = require("socket.http")
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275 local ltn12 = require("ltn12")
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276
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277 -- a simplified http.get function
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278 function http.get(u)
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279 local t = {}
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280 local respt = request{
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281 url = u,
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282 sink = ltn12.sink.table(t)
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283 }
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284 return table.concat(t), respt.headers, respt.code
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285 end
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286 </pre>
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287
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288 <!-- sinks ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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289
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290 <h3 id="source">Sources</h3>
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291
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292 <!-- cat ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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293
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294 <p class=name id="source.cat">
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295 ltn12.source.<b>cat(</b>source<sub>1</sub> [, source<sub>2</sub>, ...,
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296 source<sub>N</sub>]<b>)</b>
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297 </p>
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298
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299 <p class=description>
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300 Creates a new source that produces the concatenation of the data produced
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301 by a number of sources.
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302 </p>
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303
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304 <p class=parameters>
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305 <tt>Source<sub>1</sub></tt> to <tt>source<sub>N</sub></tt> are the original
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306 sources.
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307 </p>
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308
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309 <p class=return>
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310 The function returns the new source.
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311 </p>
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312
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313 <!-- chain ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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314
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315 <p class=name id="source.chain">
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316 ltn12.source.<b>chain(</b>source, filter<b>)</b>
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317 </p>
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318
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319 <p class=description>
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320 Creates a new <tt>source</tt> that passes data through a <tt>filter</tt>
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321 before returning it.
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322 </p>
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323
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324 <p class=return>
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325 The function returns the new source.
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326 </p>
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327
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328 <!-- empty ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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329
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330 <p class=name id="source.empty">
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331 ltn12.source.<b>empty()</b>
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332 </p>
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333
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334 <p class=description>
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335 Creates and returns an empty source.
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336 </p>
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337
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338 <!-- error ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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339
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340 <p class=name id="source.error">
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341 ltn12.source.<b>error(</b>message<b>)</b>
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342 </p>
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343
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344 <p class=description>
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345 Creates and returns a source that aborts transmission with the error
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346 <tt>message</tt>.
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347 </p>
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348
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349 <!-- file +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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350
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351 <p class=name id="source.file">
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352 ltn12.source.<b>file(</b>handle, message<b>)</b>
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353 </p>
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354
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355 <p class=description>
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356 Creates a source that produces the contents of a file.
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357 </p>
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358
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359 <p class=parameters>
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360 <tt>Handle</tt> is a file handle. If <tt>handle</tt> is <tt><b>nil</b></tt>,
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361 <tt>message</tt> should give the reason for failure.
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362 </p>
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363
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364 <p class=return>
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365 The function returns a source that reads chunks of data from
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366 given <tt>handle</tt> and returns it to the user,
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367 closing the file when done, or a source that aborts the transmission with
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368 the error <tt>message</tt>
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369 </p>
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370
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371 <p class=note>
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372 In the following example, notice how the prototype is designed to
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373 fit nicely with the <tt>io.open</tt> function.
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374 </p>
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375
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376 <pre class=example>
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377 -- load the ltn12 module
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378 local ltn12 = require("ltn12")
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379
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380 -- copy a file
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381 ltn12.pump.all(
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382 ltn12.source.file(io.open("original.png")),
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383 ltn12.sink.file(io.open("copy.png"))
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384 )
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385 </pre>
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386
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387 <!-- simplify +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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388
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389 <p class=name id="source.simplify">
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390 ltn12.source.<b>simplify(</b>source<b>)</b>
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391 </p>
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392
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393 <p class=description>
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394 Creates and returns a simple source given a fancy <tt>source</tt>.
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395 </p>
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396
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397 <!-- string +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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398
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399 <p class=name id="source.string">
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400 ltn12.source.<b>string(</b>string<b>)</b>
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401 </p>
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402
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403 <p class=description>
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404 Creates and returns a source that produces the contents of a
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405 <tt>string</tt>, chunk by chunk.
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406 </p>
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407
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408 <!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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409
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410 <div class=footer>
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411 <hr>
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412 <center>
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413 <p class=bar>
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414 <a href="home.html">home</a> &middot;
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415 <a href="home.html#down">download</a> &middot;
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416 <a href="installation.html">installation</a> &middot;
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417 <a href="introduction.html">introduction</a> &middot;
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418 <a href="reference.html">reference</a>
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419 </p>
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420 <p>
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421 <small>
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422 Last modified by Diego Nehab on <br>
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423 Thu Apr 20 00:25:41 EDT 2006
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424 </small>
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425 </p>
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426 </center>
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427 </div>
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428
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429 </body>
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430 </html>